Window lock



May 27; 1924. 1,495,914

W. .J. M DONALD WINDOW LOCK l iledJune 21, 1922 2 -S 1 Fig 7. 29

wufMc Donald INVENTOR May 27 1924.

W. J. M DONALD WINDOW LOCK Filed June 21, 1922 2 Sheets=-$heat g WU. Mc Donald INVENTOR ATTORNEY Patented May 127, 1924.

WILLIAM J. ivienoivnnn, or oou vcrnnnrrrrs, IO A.

WINDOW LOCK.

Application filed June 21, 1922. Serial No. 569,793.

To all whom it may concern:

Be it known that I, VILLIAM J. Mo- DONALD, a citizen of the United States, residing at Council Bluffs, in the county of Pottawattamie and State of Iowa, have invented new and useful Improvements in Window Locks, of which the following is a specification.

This invention relates to sash locks for windows and has for an object the provision of means whereby the upper or lower sash, or both sash of a window may be opened sufiiciently to provide proper ventilation, but held against further opening from the outside of the window.

Another object of the invention is the provision of a look as above stated, which is simple in construction and operation and which may be easily applied.

With the above and other objects in view, the invention further includes the following novel features and details of construction, to be hereinafter more fully described, illustrated in the accompanying drawings and pointed out in the appended claims.

In the drawings Figure 1 is an elevation of a portion of a window with the invention applied.

Figure 2 is a vertical sectional view with the locking bolt extended.

Figure 3 is a similar view with the bolt retracted.

Figure 1 is a. transverse sectional view showing the stop plate in plan.

Figure 5 is a detail perspective view of the lock casing.

Figure 6 is a like view of the locking bolt.

Figure 7 is a detail perspective view of the latch.

Referring in detail to the drawings, wherein like characters of reference denote corresponding parts, the reference characters 10 and 11 indicate respectively the upper and lower sash of a window, the casing of which is shown at 12.

The invention which is designed to be applied to either the upper sash 10 or the window casing 12, but is shown as applied to the former, comprisesa casing which is mortised into the upper sash 10 and which includes a face plate 13 and rearwardly extending spaced parallel side or bearing plates 14, the latter being preferably formed integral with the former. The casing is secured in place by means of screws 15 which pass through openings in each end of the face plate '13. i

Pivotally mounted between the plates 14 upon a pivot pin 16 -is a locking bolt 17, the said bolt being providedwith a substantially triangular projection 18, one edge of which defines a shoulder 19,. The projection 18 is designed to be extended through an elongatedopening 20 provided in the face plat 13.

outward to alocking position by means of a spring 22gwhich is mounted upon a stud 23 secured between the parallel plates 14.

The bolt is normally urged Also; pivotally mounted between the plates 14: as shown at 21is' a dog 25-w hose outer free end 26' extends through anelongated opening-27 provided in the face 'plate 13.

Extending fromone edge'of the dog' isv a projection whose opposite ends define spaced rails 28 and 29, which are adapted to be engaged by the projection 21 of the bolt 17, being yieldingly forced into the path of the bolt by means of a spring 30.

In the use of the invention, the lock is secured a suitable distance from the meeting rails of the sashes and when the upper sash is lowered or the lower sash is raised, the meeting rail of the latter will engage the stop shoulder 19 provided on the locking bolt 17, when the latter is extended, a stop plate 32 being secured to the meeting rail of the lower sash 11 to engage the bolt so as to prevent injury to the sash. As shown in the drawings, when the bolt 17 is in projected or looking position, the extension 21 will be engaged by the shoulder 28 of the dog 25 so as to prevent the bolt from being forced inward. When it is desired to raise or lower the sash beyond the bolt. the dog 25 is forced downward out of the path of the projection 21 and the bolt 18 moved inward. When at its inward limit of movement, the projection 21 of the. bolt will engage the shoulder 29 so as to hold the said bolt against accidental movement. By moving the locking dog 25 downward against the spring 30, the bolt 18 will be automatically projected by means of the spring 22.

The face of the outer free end 26 of the dog 25 is almost flush with the face of the face plate 13 and the said dog 25 may be forced downward by the friction of the thumb or finger, but cannot be operated from the outside of the window by means of a long hook or other light contrivancee v The invention is susceptible of various changes in its form, pro-portions and minor details of construction and the right is herein reserved to make such changes as properly fall within the scope of'the appended claims.

Having described the invention what is claimed is 1. A sash lock comprising a casing including a face plate having elongated openings therein and spaced parallel bearing plates extending 'rearwardly from the face plate, a spring actuated locking bolt having one end pivotally mounted between the bearing plates and adapted to be projected through one of the openings in the face plate, a spring actuated locking dog also havingone end pivotally mounted between the bearing plates and extending through the opening and means carried by the dog for engagement with the locking bolt to hold the latter in position. I

2'. A device of the character described comprising a casing having openings in one face thereof, a pivoted latch element ing the dog to a position where the shoulder i will abut the extension.

3. A device of the character described having a casing having a pair of openings in its front wall, a triangular shaped latch element pivoted in the casing, resilient means normally urging the same through one of the openings, a locking dog pivoted in the casing and having an extension extending through the other of said openings,

a cooperating abutment carried by the latch element and dog, and resilient means normally urging the latch element outwardly and the dog toward the latch element.

In testimony whereof Iaflix my signature.

' WILLIAM J. MCDONALD. 

